DOI: 10.1016/j.atmosenv.2017.10.034
Scopus记录号: 2-s2.0-85032179045
论文题名: On the influence of atmospheric super-saturation layer on China's heavy haze-fog events
作者: Wang J ; , Yang Y ; , Zhang X ; , Liu H ; , Che H ; , Shen X ; , Wang Y
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 171 起始页码: 261
结束页码: 271
语种: 英语
英文关键词: Condensation
; Isentropic atmospheric process
; Pollution mixing layer
; Super-saturation
Scopus关键词: Aerosols
; Air pollution
; Air quality
; Condensation
; Earth atmosphere
; Mixing
; Pollution
; Silicon compounds
; Aerosol concentration
; Atmospheric process
; Convective inhibition
; Meteorological condition
; Mixing layers
; PM2.5 concentration
; Pollution particles
; Yangtze river delta
; River pollution
; aerosol
; air quality
; airflow
; atmospheric pollution
; condensation
; fog
; haze
; mixed layer
; supersaturation
; adiabaticity
; air pollution
; airflow
; altitude
; ambient air
; Article
; atmosphere
; China
; energy
; fog
; haze
; humidifier
; particle size
; priority journal
; China
; Guangdong
; North China Plain
; Sichuan Basin
; Yangtze River
; Zhujiang Delta
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: With the background of global change, the air quality in Earth's atmosphere has significantly decreased. The North China Plain (NCP), Yangtze River Delta (YRD), Pearl River Delta (PRD) and Si-Chuan Basin (SCB) are the major areas suffering the decreasing air quality and frequent pollution events in recent years. Studying the effect of meteorological conditions on the concentration of pollution aerosols in these pollution sensitive regions is a hot focus now. This paper analyses the characteristics of atmospheric super-saturation and the corresponding H_PMLs (height of supersaturated pollution mixing layer), investigating their contribution to the frequently-seen heavy haze-fog weather. The results suggest that: (1) in the above-mentioned pollution sensitive regions in China, super-saturated layers repeatedly appear in the low altitude and the peak value of supersaturation S can reach 6–10%, which makes pollution particles into the wet adiabatic uplift process in the stable-static atmosphere. After low-level atmosphere reaches the super-saturation state below the H_PMLs, meteorological condition contributes to humidification and condensation of pollution particles. (2) Caculation of condensation function Fc, one of PLAM sensetive parameter, indicates that super-saturation state helps promote condensation, beneficial to the formation of Condensational Kink (CK) in the pollution sensitive areas. This favors the formation of new aerosol particles and intensities the cumulative growth of aerosol concentration. (3) By calculating the convective inhibition energy on average │CIN│ > 1.0 × 104 J kg−1, we found the value is about 100 times higher than the stable critical value. The uplifting diffusion of the particles is inhibited by the ambient airflow. So, this is the important reason for the aggravation and persistence of aerosol pollutants in local areas. (4) H_PMLs is negatively correlated to the pollution meteorological condition index PLAM which can describe the change of PM2.5 concentration. The lower the H_PMLs is, the higher the PLAM becomes, and the more conductive the air condition is to aggravation of pollutant aerosol concentration. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82162
Appears in Collections: 气候变化事实与影响
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作者单位: Atmospheric Composition Observing & Service Center, Chinese Academy of Meteorological Sciences, Beijing, China; China Meteorological Administration Training Centre, Beijing, China
Recommended Citation:
Wang J,, Yang Y,, Zhang X,et al. On the influence of atmospheric super-saturation layer on China's heavy haze-fog events[J]. Atmospheric Environment,2017-01-01,171